is decisive if contour turning is involved.

Transcription

1 Toolholder selection The clamping system of the insert in the toolholder should be selected first. Toolholders have been ed to provide optimum performance in different applications and usually over a broad area. The type of operation and, to some extent, size of workpiece determines the selection of toolholding system. Roughing operations on large workpieces make considerably different demands to that of finishing of small components. s a basis the selection of clamping system should be taken from with the table on the following pages. It is impossible to pin-point every type of application, especially as the systems overlap at some stage. owever, the general purpose is indicated for each system. n over-riding recommendation is to use the more modern systems: oroturn R and oroturn 107 Secure insert and toolholder clamping is an essential factor in turning for stability. The effective entering angle (κ 1 ) should also be considered for satisfactory machining when the operation involves copying or profiling. The maximum in-copying angle (β) is recommended for each tool type and treated more thoroughly in the part on opying. 1 Turning 2 acing 3 Profiling When the edge clamping system is established, the toolholder size and type should be established. The selection is influenced by feed directions, size of cuts, workpiece and toolholding in machines as well as accessibility required. The shape of the workpiece is decisive if contour turning is involved. omposite operations should be divided into basic cuts for assessment of which toolholder type is most suitable: longitudinal turning (1), facing (2), profiling (3) and plunging (4). There is also contouring involving round shapes but this can be seen as being similar to profiling. Toolholder types are defined by the entering angle and the point angle the shape of the insert used. The selection process at this stage involves cutting forces, edge strength and accessibility of tool. This information should be combined with general insert shape recommendations and that of the influence of cutting forces. The guiding rule is to select the largest toolholder size (h) possible for the machine. This is in order to reduce the tool overhang ratio and to provide the most rigid base for the edge. The toolholder size should then also be coordinated with the subsequent selection of insert size, where the effective cutting edge length is determined. enerally, the smallest entering angle that the operations will allow should be selected. This is in accordance with the advantages discussed on the effect of the entering angle. 4 Plunging The effective entering angle (κ 1 ) should also be considered for satisfactory machining when the operation involves copying or profiling. There is a maximum in-copying angle (β) recommended for each tool type. 30

2 Turning Tool selection for internal turning - Select T-Max P or oroturn R boring bars for large hole diameters Select oroturn 107 boring bars for small and medium sized holes with positive inserts giving smaller cutting forces - Select oroturn 111 boring bars as problem-solvers for small dimensions, long overhangs or when using tuned boring bars. - oroturn XS for smaller hole diameters or large diameter hole (minimum diameter 100 mm), oroturn SL with quickchanging function reduces tool changing times and has a radial adjustable setting for the cutting edge (f1 dimension). daptors provide broad programme of 40 mm diameter tool range within oroturn SL range, 580-system range and for shank tool solutions ers using the 580-coupling. Tuned bars ranging from 100 to 300 mm in diameter for overhangs of up to 10 times the diameter with oromant apto, oroturn SL (570) cutting heads and square shank tools. - or large diameter-boring (often performed in flat-bed machines) consider the use of tuned boring bars and adapt- - onsider the use of boring bars with exchangeable cutting heads type oroturn SL (570), as an efficient modular system for most types of machining applications, where oromant apto or conventional tool holding are options. iameter range : mm, overhangs of up to 10 times the diameter with tuned bars. 31

3 Toolholders for external turning 1 - Turning 2 - acing 3 - Profiling 4 - Plunging 5 - xternal machining of small, long and slender components = oroturn Negative inserts Positive inserts eramic and N inserts Tooling system oroturn R T-MX P oroturn 107 oroturn R T-MX lamping system Rigid clamp Lever Wedge clamp Screw clamp Rigid clamp Top clamp Longitudinal turning/facing Operation Profiling acing Plunging = Recommended toolholder system = lternative 32

4 Toolholders for internal turning Turning T-Max P oroturn XS oroturn 107 Internal turning of holes from 20 Internal machining of extra small hole diameters, starting at 1 mm diameters (Small part machining) irst choice for internal machining of small and medium holes from 8 mm diameter. oroturn 111 or optimization of internal turning operations requring small cutting forces when machining with long tool overhangs. mm in diameter with short tool overhangs and stable conditions. Tooling system lamping system oroturn R Negative inserts T-MX P oroturn 107 Positive inserts oroturn 111 eramic and N inserts T-MX Rigid clamp Lever clamp Wedge clamp Screw clamp Top clamp Longitudinal turning/ facing Operation Profiling acing = Recommended toolholder system = lternative 33

5 Tools for Internal Turning oroturn 107 and oroturn 111 oring bars Pretuned and easy to use cylindrical boring bars with carbide shaft. Optimum performance in a split sleeve holder. Shank diameter 10 and12 mm for minimum hole Ø13 andø16 mm, repectively. Recommended tool overhang from 6-10 times the bar diameter. Integrated tip-seat pocket ed for T or style inserts. oroturn SL oring bars Pretuned and easy to use cylindrical boring bars. oolant through the centre and SL coupling in front. Optimum performance when combined with a split sleeve holder. esigned for exchangeable SL cutting heads. Recomended tool overhang from 4-10 times the bar diameter. oroturn SL arbide Reinforced oring bars Pretuned and easy to use carbide reinforced cylindrical boring bars. oolant through the centre and SL coupling in front. arbide reinforced for increased static stiffness (three times the stiffnes of steel). Optimum performance when combined with a split sleeve holder. Recomended tool overhang from times the bar diameter. 1. Steel boring bars: Up to 4 x 2. arbide boring bars: Up to 6 x 3. Steel damped boring bars short : Up to 7 x 4. Steel damped boring bars long : Up to 10 x 5. arbide reinforced, damped boring bars: Up to 14 x 34

6 oroturn SL oromant apto oring bars Steel and Silent Tools are easy to use with oromant apto boring bars. oolant through the centre and SL coupling in front. Rigid clamping and very short set up time. Sizes 3-8 for back end coupling. oroturn SL quick change oring bars R IM: mm Pretuned and easy to use cylindrical boring bars. oolant through the centre and SL quick change coupling at front end. Optimum performance when combined with a split sleeve holder. esigned for exchangeable SL quick change cutting heads or 40 mm diameter SL cutting heads. Recomended tool overhang up to 10 times the bar diameter. or flat and slant bed machines. 580 oring bars Tuned cylindrical boring bars. oolant through the centre and 580 coupling at front end. Shank diameter range : mm. Recommended tool overhang 5-10 times the bar diameter. specially suitable for flat bed machines. Special solutions available. Reduction adapter at front end makes it possible to use a wide range of cutting units, even the oroturn SL quick change system. Surface finish (microns) R a Solid steel bar 2. arbide bar 3. Short, damped bar 4. Long, damped bar 5. xtra long, damped bar L/ 35

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